Flexible all purpose drill attachment

ABSTRACT

A SANDING MACHINE FOR THE PURPOSE OF SANDING CYLINDRICAL SURFACES, THE DEVICE COMPRISING AN ENDLESS SANDPAPER BELT MOUNTED AROUND THREE ROLLERS, ONE OF WHICH IS POWER DRIVEN BY A PORTABLE DRILL OR THE LIKE, THE WORK TO BE SANDED BEING POSITIONED ADJACENT THE SANDPAPER BELT AT A LOCATION BETWEEN THE TWO OTHER ROLLERS WHEREBY THE SANDPAPER BELT WILL BE DEFLECTED INTO AN ARCUATE CONFIGURATION AT THIS POINT SO AS TO EXTEND OVER A RELATIVELY LARGE PORTION OF THE CYLINDRICAL SURFACE BEING SANDED.

March 2, 1971 JQ AQB ITTON 3,566,549"

FLEXIBLE ALL PURPOSE DRILL ATTACHMENT Filed Jan. 21, 1969 flaws/vibe LL/AMES 9; 52/ ro/v United States Patent Ofice.

3,566,549 Patented Mar. 2, 1971 3,566,549 FLEXIBLE ALL PURPOSE DRILL ATTACHMENT James A. Britton, Whitesburg, Tenn. 37891 Filed Jan. 21, 1969, Ser. No. 792,631 Int. Cl. B2411 23/00 US. Cl. 51170 1 Claim ABSTRACT OF THE DISCLOSURE This invention relates generally to sanding devices.

A principal object of the present invention is to provide a sander for the purpose of sanding a cylindrical surface of a work and wherein the sander will accordingly engage a relatively large surface of the cylindrical work at all times.

Another object of the present invention is to provide an attachment sander which can be secured to a portable drill for purpose of being powered thereby.

Yet another object of the present invention is to provide a drill attachment sander which is readily adaptable for sanding cylindrical surfaces of any varied arcuate surface of a work.

Other objects of the present invention are to provide a flexible all purpose drill attachment sander which is simple in design, inexpensive to manufacture, rugged in construction, easy to use and efficient in operation.

These and other objects will be readily evident upon a study of the following specification and the accompanying drawing wherein:

FIG. 1 is a side elevation view of the present invention shown in operative use,

FIG. 2 is a bottom view thereof, and

FIG. 3 is a perspective view of the sandpaper belt.

Referring now to the drawing in detail, the reference numeral represents a flexible all purpose drill attachment sander, according to the present invention, wherein there is a frame 11. comprised of a main arm 12 and a pivotable arm 13. The main arm 12 is provided with a handle portion 14 at one end thereof and at its opposite end carries a pin 15 upon which a roller 16 is mounted rotatably free. The pivotable arm 13 has a pin 17 secured to one end thereof, the pin carrying a roller 18 rotatably free thereupon. The opposite end of the pivotable arm is mounted pivotally free upon a pin 19 mounted along an intermediate portion of the main arm 12. A tension spring 20 supported around a pin 21 mounted upon the main arm has one end 22 thereof bearing against a pin 23 mounted on a main arm and an end 24 which bears against a pin 25 mounted on the pivotable arm 13.

The tension spring 20 normally urges the pivotable arm to pivot outwardly away from the main arm.

A bearing block 26 is rigidly affixed to one side of the main arm 12 for the purpose of supporting rotatably free a shaft 27 upon which there is rigidly afiixed a roller 28. One end of the shaft 27 protrudes outwardly of the bearing block 26 so as to be engageable within a chuck 29 of a portable hand drill 30.

An endless sandbelt 31 is fitted around the rollers 16, 18 and 28 and is maintained in tension by means of the outwardly urged pivotable arm 13.

In operative use, as shown in FIG. 1 of the drawing, the device is shown to sand a rung 32 of cylindrical configuration, the rung being located between legs 33 of a stool 34. In order to sand a cylindrical surface such as of a rung 32, the portion of the sandpaper belt located between the rollers 16 and 18 is placed against the cylindrical side of the work and the drill motor is turned on so as to cause the sandpaper belt to travel around the three rollers. As is evident in FIG. 1 of the drawing, when the sandpaper belt is urged toward the work, the belt will assume an arcuate configuration adjacent the work thereby sanding a relativvely larger portion thereof than would be possible with a straight surface sandpaper, thereby producing a more efiicient work.

What I new claim is:

1. In a flexible all-purpose drill attachment sander, the combination of a frame, said frame being comprised of a main arm and a pivotable arm, said main arm carrying a first roller, said pivotable arm carrying a second roller, an endless sandpaper belt being carried around said rollers of said main arm and said pivotable arm, and means for driving said endless sandpaper belt so to travel between said rollers, said main arm having a pin secured thereto at one end, said first roller being mounted rotatably free on said pin, the opposite end of said main arm comprising a handle, said pivotable arm having a pin secured to one end thereof, said pin having said second roller mounted rotatably free thereupon, the opposite end of said pivotable arm being mounted pivotally free on a pin secured along an intermediate portion of said main arm, a hearing block being secured rigidly along an intermediate portion of said main arm, said bearing block supporting a rotatably free shaft having a third roller afiixed thereto, the first, second and third rollers supporting said endless sandpaper belt therearound, and one end of said shaft extending outwardly of said bearing block engaged within a chock of a portable hand drill, a tension spring being mounted around a pin or post secured to said main arm, one end of said tension spring bearing against a post mounted on said main arm, and the other end of said tension spring bearing against a post mounted on said pivotable arm, said tension spring normally urging said pivotable arm away from said main arm thus providing a tension on said endless sandpaper 'belt, and said handle extending along a longitudinal axis of said main arm, longitudinal axis of said handle extending transversely across the axis of said first roller.

References Cited UNITED STATES PATENTS 1,147,594 7/1915 Ball 51170.4 1,916,543 7/ 1933 Welch 51170.4 2,560,102 7/1951 Guinn 51170.4 2,976,652 3/1961 Bedortha et a1. 51170.4 3,049,841 8/1962 Guinn 51l70.4 3,093,170 6/ 1963 'Ihayer 51170.4 3,335,528 8/1967 Bader 51170.4

WILLIAM R. ARMSTRONG, Primary Examiner US. Cl. X.R. 51357 

